package com.shengruan.common;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteOrder;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
public class IPSeeker {
    private class IPLocation {
        public String country;
        public String area;
        public IPLocation() {
            country = area = "";
        }
        public IPLocation getCopy() {
            IPLocation ret = new IPLocation();
            ret.country = country;
            ret.area = area;
            return ret;
        }
    }

    private  String IP_FILE = Constants.APP_PATH +File.separator+"assets"+File.separator+"ip"+File.separator+"QQWry.Dat";
    public  void setIpFile(String filePath)
    {
    	this.IP_FILE = filePath;
    }
    private static final int IP_RECORD_LENGTH = 7;
    private static final byte AREA_FOLLOWED = 0x01;
    private static final byte NO_AREA = 0x2;
    @SuppressWarnings("unchecked")
	private Hashtable ipCache;
    private RandomAccessFile ipFile;
// 内存映射文件
    private MappedByteBuffer mbb;
// 单一模式实例
    private static IPSeeker instance = new IPSeeker();
// 起始地区的开始和结束的绝对偏移
    private long ipBegin, ipEnd;
// 为提高效率而采用的临时变量
    private IPLocation loc;
    private byte[] buf;
    private byte[] b4;
    private byte[] b3;
    @SuppressWarnings("unchecked")
	private IPSeeker() {
        ipCache = new Hashtable();
        loc = new IPLocation();
        buf = new byte[100];
        b4 = new byte[4];
        b3 = new byte[3];
        try {
            ipFile = new RandomAccessFile(IP_FILE, "r");
        } catch (FileNotFoundException e) {
            System.out.println(IP_FILE);
            System.out.println("IP地址信息文件没有找到，IP显示功能将无法使用");
            ipFile = null;
        }
        if (ipFile != null) {
            try {
                ipBegin = readLong4(0);
                ipEnd = readLong4(4);
                if (ipBegin == -1 || ipEnd == -1) {
                    ipFile.close();
                    ipFile = null;
                }
            } catch (IOException e) {
                System.out.println("IP地址信息文件格式有错误，IP显示功能将无法使用");
                ipFile = null;
            }
        }
    }
    public static IPSeeker getInstance() {
        return instance;
    }
    @SuppressWarnings("unchecked")
	public List getIPEntriesDebug(String s) {
        List ret = new ArrayList();
        long endOffset = ipEnd + 4;
        for (long offset = ipBegin + 4; offset <= endOffset;
                           offset += IP_RECORD_LENGTH) {
            long temp = readLong3(offset);
            if (temp != -1) {
                IPLocation loc = getIPLocation(temp);
                if (loc.country.indexOf(s) != -1 || loc.area.indexOf(s) != -1) {
                    IPEntry entry = new IPEntry();
                    entry.country = loc.country;
                    entry.area = loc.area;
                    readIP(offset - 4, b4);
                    entry.beginIp = Utils.getIpStringFromBytes(b4);
                    readIP(temp, b4);
                    entry.endIp = Utils.getIpStringFromBytes(b4);
                    ret.add(entry);
               }
            }
        }
        return ret;
    }

    @SuppressWarnings("unchecked")
	public List getIPEntries(String s) {
        List ret = new ArrayList();
        try {
            if (mbb == null) {
                FileChannel fc = ipFile.getChannel();
                mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, ipFile.length());
                mbb.order(ByteOrder.LITTLE_ENDIAN);
            }
            int endOffset = (int) ipEnd;
            for (int offset = (int) ipBegin + 4; offset <= endOffset;
                              offset += IP_RECORD_LENGTH) {
                int temp = readInt3(offset);
                if (temp != -1) {
                    IPLocation loc = getIPLocation(temp);
                    if (loc.country.indexOf(s) != -1 ||
                        loc.area.indexOf(s) != -1) {
                        IPEntry entry = new IPEntry();
                        entry.country = loc.country;
                        entry.area = loc.area;
                        readIP(offset - 4, b4);
                        entry.beginIp = Utils.getIpStringFromBytes(b4);
                        readIP(temp, b4);
                        entry.endIp = Utils.getIpStringFromBytes(b4);
                        ret.add(entry);
                    }
                }
            }
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
        return ret;
    }
    private int readInt3(int offset) {
        mbb.position(offset);
        return mbb.getInt() & 0x00FFFFFF;
    }
    private int readInt3() {
        return mbb.getInt() & 0x00FFFFFF;
    }
    @SuppressWarnings("unchecked")
	public String getCountry(byte[] ip) {
        if (ipFile == null)return "错误的IP数据库文件";
        String ipStr = Utils.getIpStringFromBytes(ip);
        if (ipCache.containsKey(ipStr)) {
            IPLocation loc = (IPLocation) ipCache.get(ipStr);
            return loc.country;
        } else {
            IPLocation loc = getIPLocation(ip);
            ipCache.put(ipStr, loc.getCopy());
            return loc.country;
        }
    }
    public String getCountry(String ip) {
        return getCountry(Utils.getIpByteArrayFromString(ip));
    }
    @SuppressWarnings("unchecked")
	public String getArea(byte[] ip) {
        if (ipFile == null)return "错误的IP数据库文件";
        String ipStr = Utils.getIpStringFromBytes(ip);
        if (ipCache.containsKey(ipStr)) {
            IPLocation loc = (IPLocation) ipCache.get(ipStr);
            return loc.area;
        } else {
            IPLocation loc = getIPLocation(ip);
            ipCache.put(ipStr, loc.getCopy());
            return loc.area;
        }

    }
    public String getArea(String ip) {
        return getArea(Utils.getIpByteArrayFromString(ip));
    }
    private IPLocation getIPLocation(byte[] ip) {
        IPLocation info = null;
        long offset = locateIP(ip);
        if (offset != -1)
            info = getIPLocation(offset);
        if (info == null) {
            info = new IPLocation();
            info.country = "未知国家";
            info.area = "未知地区";
        }
        return info;
    }
    private long readLong4(long offset) {
        long ret = 0;
        try {
            ipFile.seek(offset);
            ret |= (ipFile.readByte() & 0xFF);
            ret |= ((ipFile.readByte() << 8) & 0xFF00);
            ret |= ((ipFile.readByte() << 16) & 0xFF0000);
            ret |= ((ipFile.readByte() << 24) & 0xFF000000);
            return ret;
        } catch (IOException e) {
            return -1;
        }
    }

    private long readLong3(long offset) {
        long ret = 0;
        try {
            ipFile.seek(offset);
            ipFile.readFully(b3);
            ret |= (b3[0] & 0xFF);
            ret |= ((b3[1] << 8) & 0xFF00);
            ret |= ((b3[2] << 16) & 0xFF0000);
            return ret;
        } catch (IOException e) {
            return -1;
        }
    }
    private long readLong3() {
        long ret = 0;
        try {
            ipFile.readFully(b3);
            ret |= (b3[0] & 0xFF);
            ret |= ((b3[1] << 8) & 0xFF00);
            ret |= ((b3[2] << 16) & 0xFF0000);
            return ret;
        } catch (IOException e) {
            return -1;
        }
    }
    private void readIP(long offset, byte[] ip) {
        try {
            ipFile.seek(offset);
            ipFile.readFully(ip);
            byte temp = ip[0];
            ip[0] = ip[3];
            ip[3] = temp;
            temp = ip[1];
            ip[1] = ip[2];
            ip[2] = temp;
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }

    private void readIP(int offset, byte[] ip) {
        mbb.position(offset);
        mbb.get(ip);
        byte temp = ip[0];
        ip[0] = ip[3];
        ip[3] = temp;
        temp = ip[1];
        ip[1] = ip[2];
        ip[2] = temp;
    }
    private int compareIP(byte[] ip, byte[] beginIp) {
        for (int i = 0; i < 4; i++) {
            int r = compareByte(ip[i], beginIp[i]);
            if (r != 0)
                return r;
        }
        return 0;
    }

    private int compareByte(byte b1, byte b2) {
        if ((b1 & 0xFF) > (b2 & 0xFF)) // 比较是否大于
            return 1;
        else if ((b1 ^ b2) == 0) // 判断是否相等
            return 0;
        else
            return -1;
    }
    private long locateIP(byte[] ip) {
        long m = 0;
        int r;
        readIP(ipBegin, b4);
        r = compareIP(ip, b4);
        if (r == 0)return ipBegin;
        else if (r < 0)return -1;
        for (long i = ipBegin, j = ipEnd; i < j; ) {
            m = getMiddleOffset(i, j);
            readIP(m, b4);
            r = compareIP(ip, b4);
            if (r > 0)
                i = m;
            else if (r < 0) {
                if (m == j) {
                    j -= IP_RECORD_LENGTH;
                    m = j;
                } else
                  j = m;
            } else
                return readLong3(m + 4);
        }
        m = readLong3(m + 4);
        readIP(m, b4);
        r = compareIP(ip, b4);
        if (r <= 0)return m;
        else return -1;
    }
    private long getMiddleOffset(long begin, long end) {
        long records = (end - begin) / IP_RECORD_LENGTH;
        records >>= 1;
        if (records == 0) records = 1;
        return begin + records * IP_RECORD_LENGTH;
    }
    private IPLocation getIPLocation(long offset) {
        try {
            ipFile.seek(offset + 4);
            byte b = ipFile.readByte();
            if (b == AREA_FOLLOWED) {
                long countryOffset = readLong3();
                ipFile.seek(countryOffset);
                b = ipFile.readByte();
                if (b == NO_AREA) {
                    loc.country = readString(readLong3());
                    ipFile.seek(countryOffset + 4);
                } else
                    loc.country = readString(countryOffset);
                loc.area = readArea(ipFile.getFilePointer());
            } else if (b == NO_AREA) {
                loc.country = readString(readLong3());
                loc.area = readArea(offset + 8);
            } else {
                loc.country = readString(ipFile.getFilePointer() - 1);
                loc.area = readArea(ipFile.getFilePointer());
            }
            return loc;
        } catch (IOException e) {
            return null;
        }
    }
    private IPLocation getIPLocation(int offset) {
        mbb.position(offset + 4);
        byte b = mbb.get();
        if (b == AREA_FOLLOWED) {
            int countryOffset = readInt3();
            mbb.position(countryOffset);
            b = mbb.get();
            if (b == NO_AREA) {
                loc.country = readString(readInt3());

                mbb.position(countryOffset + 4);
            } else
                loc.country = readString(countryOffset);
            loc.area = readArea(mbb.position());
        } else if (b == NO_AREA) {
            loc.country = readString(readInt3());
            loc.area = readArea(offset + 8);
        } else {
            loc.country = readString(mbb.position() - 1);
            loc.area = readArea(mbb.position());
        }
        return loc;
    }
    private String readArea(long offset) throws IOException {
        ipFile.seek(offset);
        byte b = ipFile.readByte();
        if (b == 0x01 || b == 0x02) {
            long areaOffset = readLong3(offset + 1);
            if (areaOffset == 0)
                return "未知地区";
            else
                return readString(areaOffset);
        } else
            return readString(offset);
    }
    private String readArea(int offset) {
        mbb.position(offset);
        byte b = mbb.get();
        if (b == 0x01 || b == 0x02)
        {
            int areaOffset = readInt3();
            if (areaOffset == 0)
                return "未知地区";
            else
                return readString(areaOffset);
        } else
            return readString(offset);
    }
    private String readString(long offset) {
        try {
            ipFile.seek(offset);
            int i;
            for (i = 0, buf[i] = ipFile.readByte(); buf[i] != 0;
                                buf[++i] = ipFile.readByte());
            if (i != 0)
                return Utils.getString(buf, 0, i, "GBK");
        } catch (IOException e)
        {
            System.out.println(e.getMessage());
        }
        return "";
    }
    private String readString(int offset) {
        try {
            mbb.position(offset);
            int i;
            for (i = 0, buf[i] = mbb.get(); buf[i] != 0; buf[++i] = mbb.get());
            if (i != 0)
                return Utils.getString(buf, 0, i, "GBK");
        } catch (IllegalArgumentException e) {
            System.out.println(e.getMessage());
        }
        return "";
    }
    public  String getAddress(String ip)
   {
        String country = getCountry(ip).equals(" CZ88.NET") ? "" :
                         getCountry(ip);
        String area = getArea(ip).equals(" CZ88.NET") ? "" : getArea(ip);
        String address = country + " " + area;
        return address.trim();
    }
}
